222
HARTREY AVE.. EVANSTON, IL.
60204
U.S.A.
Q
MODEL M677
AREA
CODE
312/866-2200
.
CABLE: SHUREMICRO
I
:iEtT
ACCESSORY MIXER
TWX:
910-231-0048
TELEX:
72-4381
I
GENERAL
The Shure Model M677 is a transistorized, six-input
accessory mixer designed for use with such products
as the Shure M67 and M68 Series Microphone Mixers,
SE30 Gated
Compressor/Mixer, and M63 AUDIO
MASTER@. When used with either the M67 or M68, it
provides a low-cost and convenient means of adding
six additional input channels (10 total). When used
with the
SE30, it converts the three-input mixer system
to a nine-input system for applications such as tele-
vision broadcasting. For instance, when used with the
M63, the combination provides a six-channel mixer
with extremely flexible equalization, a 600-ohm line
output, a VU meter, and a headphone monitor.
The M677 is designed to connect to and operate
from the 28-30 Vdc output of the Shure mixer product
with which it will be used, or from the Shure
A67B
Battery Power Supply. When this external power sup-
ply is used, the M677's high- or low-impedance micro-
phone-level output allows it to be used with virtually
any audio equipment having a microphone input (audio
tape recorder, video recorder, PA system, etc.).
Model
M677
Features:
H
Adds extra inputs to Shure mixers
H
Six balanced input channels
H
Switch-selectable inputs: low impedance micro-
phone- or line-level
H
Professional three-pin input connectors
H
Microphone output with professional three-pin con-
nector and high-low impedance selection
H
Connects to mix bus or aux input on associated
mixer
H
Six individual rotary input volume controls
H
Switchable lo-cut filters on each channel
H
Obtains power from associated Shure mixer or
battery power supply
SPECIFICATIONS
Inputs
NO. LEVEL IMPEDANCE CONNECTOR
LO-Z
MIC/LINE
Low (MIC) 3-pin professional
Switch Selected High (LINE) female*
Outputs
NO. LEVEL IMPEDANCE CONNECTOR
MIC
High/Low 3-pin professional
male*
MIX BUS or
AUX High phono jack
*Designed to mate with Cannon XL Series, Switchcraft A3
(Q.G.)
Series
or equivalent connector
Voltage Gain (at 1,000 Hz)*
*
OUTPUT
LOW IMP. HIGH IMP. AUX MIX
INPUT
MIC. MIC. OUTPUTt BUSti
--
MIC
-3
dB
t21.5 dB
+
38.5 dB +20.5 dB
LINE
-53.5 dB -29 dB
-12 dB -30 dB
"Microphone inputs through 150 ohms, line inputs through 600 ohms,
LO-CUT switches in FLAT position, Lo-Z microphone output terminated
In 150 ohms, Hi-Z microphone output terminated in 33 kilohms, MIX
BUS AND AUX OUTPUT terminated in 47 kilohms, all volume controls
full up.
t47
kllohm load on
MIX
BUS AND AUX OUTPUT.
tt3.5 kilohm load on MIX BUS AND AUX OUTPUT
Frequency Response
Flat
-t2 dB from 30 Hz to 20.000 Hz
Equivalent lnput Noise
At full gain, -128
dBV, 300 to 20,000 Hz noise
bandwidth, measured at MIX BUS AND AUX OUT-
PUT
Equivalent lnput Hum and Noise
At full gain, -125
dBV, 30 to 20,000 Hz noise
bandwidth, measured at MIX BUS AND AUX OUT-
PUT
Maximum Output Hum and Noise
Noise Hum
&
Noise
--
(300-20,000
Hz)
(20-20,000
Hz)
MIX BUS AND AUX
OUTPUT
-95
dBV
-92
dBV
(all controls min.)
MIX BUS AND AUX
OUTPUT
-84
dBV
-81
dBV
(all controls max.)
Impedance
ACTUAL
INPUT DESIGNED FOR USE
WITH IMPEDANCE
MIC Input Balanced or unbalanced 25 to 800 ohms typical
600 ohm microphones
LINE Input 33 kilohms or less Line or Aux 66 kilohms typical
ACTUAL
OUTPUT DESIGNED FOR USE
WITH IMPEDANCE
Low Imp. MIC Balanced or unbalanced 25 to
40 ohms typical
600-ohm microphone level circuits
High Imp. MIC Unbalanced to 50 kilohm micro-
4.3 kilohms typical
phone level circuits
MIX BUS AND 3.5 kilohm mix bus
or
unbalanced 40 kilohms typical
AUX OUTPUT high
~mpedance aux input (up to
50K) (single output with dual
function)
Copyright 1979, Shure Brothers Inc.
27AlO8l (SJ)
Printed in.U.S.A.
Distortion
Less than 1
%
Total Harmonic Distortion at 1,000 Hz
when Low lmpedance Microphone Output is at 20
mV
level, High lmpedance Microphone Output is at
300
mV level, and MIX BUS AND AUX OUTPUT is
at 2V level (loaded with 47 kilohms).
lnput Clipping Level
Minimum Clipping Level
Low lmpedance
Microphone
Input
25
mV
(-32 dBV)
Line Input lOV (+20 dBV)
Minimum Common Mode Rejection
110 dB with microphone input of 10V at 100 Hz
Output Clipping Level
Minimum Clipping Level
Low lmpedance
Microphone Output
25
mV (-32 dBV)
High Impedance
Microphone Output
0.4V
(-
8 dBV)
Mix Bus and 0.4V
(
-
8 dBV) (3.5K load)
Aux Output
3V
(+
10 dBV) (47K load)
Phase
The Mix Bus and Aux, and Microphone Level (High
Impedance) Outputs are in phase with pin 3 of each
input connector. The Microphone Level (Low Imped-
ance) Output is in phase with each input.
Lo-Cut Filters
-6 dB at 100
Hz
typical
Volume Controls
All audio taper
Operating Voltage
27 Vdc, 6.0 t2 mA. (Meets all specifications except
clipping levels at any voltage from 20 to 34 Vdc)
Temperature Range
Operating: -7" to 57°C (20" to 135°F)
Storage: -29" to 71
"C (-20" to 160°F)
Dimensions
See Figure 1
OVERALL
DIMENSIONS
Net Weight
FIGURE
1
1.7 kg (3% lb)
INSTALLATION AND OPERATION
INPUTS
A maximum of six low-impedance dynamic, ribbon
or condenser (capacitor) microphones may be con-
nected to receptacles marked INPUT 1 through INPUT
6. With
MICILINE switches set to MIC, the inputs will
accept signals from the above microphones or
micro-
phone-level signals such as the low-impedance
microphone-level outputs of mixers. With
MICILINE
switches set to LINE, the inputs will accept balanced
600-ohm line-level signals.
30
VDC:
The attached cables and rear-panel jacks
supply 20 to 34 Vdc (6.0
mA at 27 Vdc) from an as-
sociated Shure mixer to power the M677. In addition,
the M677 may be powered from a Shure
A67B battery
power supply. NOTE: For use with Shure M68 Series
Mixers, connect only the red 30 VDC cable to the M68;
ground connection is provided through the phono or
microphone cable.
CAUTION: If the
A678 is used, the M677's attached
power cables should be insulated to avoid accidental
shorting or grounding.
OUTPUTS
MIC OUTPUTS:
The receptacle marked MIC OUTPUT
has either low- or high-impedance microphone-level
output selected by the switch above the receptacle.
This output is designed for connection to a 25 to 600
ohm microphone input or to a high-impedance micro-
phone input of an amplifier or tape recorder. (This
output may be used simultaneously with the MIX BUS
AND AUX OUTPUT connector.) See section on
CONNECTIONS for instructions on connection to a
high- or low-impedance balanced or unbalanced line.
MIX BUS AND AUX OUTPUT:
It is important to note
that both mix bus and aux output functions are fed
through the same connector. The unusual circuit
design associated with this output enables it to be
connected to a mixer, tape recorder or amplifier aux
input (47 kilohms) or a Shure mixer mix bus (3.5
kilohms). This connector cannot be used to drive
both
a mix bus and aux input at the same time, because
connection to a mix bus (about 3.5
kilohms) will reduce
the signal at this connector to a level which is too low
for most aux inputs. Note that when connected to an
AUX input, the MIX BUS AND AUX OUTPUT connector
cable should be 3m (10 ft) maximum; when connected
to a mix bus input, the cable may be up to
30m (100 ft).
For mix bus connections such as stacking several
M677's, this jack may be used with the supplied phono
pin connector cable and a
"Y"
adapter. If this jack
is
to be used to drive more than one input, a
"Y"
adapter
should also be used. See section on
CONNECTIONS
for instructions on connection to mating phono plug.
30
VDC:
The rear-panel 30 VDC jacks may be used
as output jacks to provide power to an additional M677
(as well as input jacks from an external battery sup-
ply) when the M677 is powered through the 30 VDC
attached cable connectors.
CONNECTIONS
The microphone inputs and output are three-pin
professional connectors (designed to mate with Cannon
XL series, Switchcraft A3
(Q.G.)
series or equivalent).
A mating three-pin professional male connector (to
mate with microphone INPUT) may be ordered directly
from Shure Brothers Inc. as Shure Part
RK121P. A
mating three-pin professional female connector (to
mate with MIC OUTPUT) may be ordered directly from
Shure Brothers Inc. as Shure Part
RK120P.
For microphone- or line-level balanced-line connec-
tions to these inputs and output, use two-conductor
shielded cable with the shield to pin 1, and two "hot"
leads to pins 2 and 3. For unbalanced-line
low-imped-
ance connections, use single-conductor shielded
cable with the shield to pins 1 and 2, and the "hot"
lead to pin 3. For high-impedance microphone output
or line-level input connections (unbalanced only), use
single-conductor shielded cable with the shield to pin
1 and the "hot" lead to pin 3. See Figure 2 for illustra-
tion of these alternatives.
MIC
OR
LINE
(BALANCED LINEI
LOW IMPEDANCE MIC
(UNBALANCED LINE)
HIGH IMPEDANCE
OUT OR
LINE- LEVEL INPUT
(UNBALANCED LINEI
MICROPHONE
CONNECTIONS
FIGURE 2
The MIX BUS AND AUX OUTPUT is a phono pin
jack. A 305
mm (12 in.) long interconnecting cable
(single-conductor shielded with a phono pin plug on
each end) is supplied with the
M677. Note that the
"hot" lead is connected to the phono pin plug tip and
the shield to the shell.
"Y"
connections may be made
to phono pin plugs used in the MIX BUS AND AUX
OUTPUT jack when
M677s are stacked.
OPERATION
POWER ON-OFF Switch:
Activate POWER ON-OFF
switch to turn the M677 on. Note that power supplied
by the associated Shure mixer is present at the 30 VDC
jacks whether the M677 POWER switch is on or off.
MIC/LINE Selector Switches:
Set individual channel
MICILINE switches for microphone- or line-level in-
puts as desired.
Volume Controls:
The individual volume controls for
each of the six channels are identified on the front
panel. Volume controls for individual channels not
being used should be kept at minimum setting (fully
counterclockwise). For maximum signal-to-noise ratio,
the volume controls in use should be set to the highest
position possible without incurring overload distortion.
LO-CUT Filter Switches:
Activate individual channel
LO-CUT filter switches as desired to reduce low-fre-
quency response (approximately 6 dB at 100
Hz).
Operation with Shure Mixers:
Connect the 30 VDC
power leads of the M677 to the auxiliary power output
jacks of the "master" unit (Shure M67 or M68 Micro-
phone Mixer, SE30 Gated
Compressor/Mixer, or M63
AUDIO MASTER@). Connect the M677 MIX BUS AND
AUX OUTPUT to the mix bus or aux input of the master
unit. This connection will result in a total of
10 inputs
for the M67 or M68 (the aux volume control of the M68
may be used as a submaster control for the M677 in-
puts), nine inputs for the
SE30, or six inputs (with tone
control capability) for the M63.
If a submaster function
is
desired for the M67 or SE30,
the M677 MIC OUTPUT connector may be connected
to a microphone input on the master unit. The channel
volume control becomes a submaster control for the
M677 output. Make certain the M677 HI-LO IMPED-
ANCE switch is set to match the microphone input of
the master unit.
GUARANTEE
This Shure product is guaranteed in normal use to
be free from electrical and mechanical defects for a
period of one year from date of purchase. Please
retain proof of purchase date. This guarantee includes
all parts and labor. This guarantee is in lieu of any
and all other guarantees or warranties, express or
implied, and there shall be no recovery for any con-
sequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention: Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.
REPLACEMENT PARTS
Order by Shure Kit number where RKC number is listed.
Orders received for parts where RKC number is given will be shipped in RKC quantities.
ITEM
MPI
Q111-Q161
Q112-Q162
Q171
R117-R167
S
1
S11-S61
TI 1-T61
T71
PARTS
PLACEMENT
W
I
J2
0 0
0
PRINTED CIRCUIT BOARD ASSEMBLY
SHURE
PART
NO.
90A1662
86A350
86A348
86C349
46A055
55883
55C119
90A2150
90E2150
SHURE
KIT
NO.
RKC6
RKC89
-
R
KC9
-
-
-
-
-
QTY.
IN
KIT
1
4
-
4
-
-
-
-
-
DESCRIPTION
Knob Assembly
Transistor, Silicon, NPN,
similar to Motorola
2N5210
Transistor, Silicon, PNP,
similar to Motorola
2N5087
Transistor, Silicon, NPN,
similar to Motorola
MPS6521
Potentiometer, 50K, Audio
Taper
Switch, Slide, DPDT
Switch, Slide, DPDT
Transformer and Shield
Assem bly
Transformer and Shield
Assembly
OPTIONAL ACCESSORIES
A68L LOCKING PANEL
This panel fits within the front hood of the M677
cover and locks in place to prevent tampering with
the front panel controls.
A68S STACKING KIT
This accessory consists of brackets for vertical
stacking of an M677 Mixer and any combination of
Shure Mixers or Controllers. An interconnecting
cable is included.
A68C OUTPUT CABLE KIT
The A68C Output Cable Kit provides a convenient
and flexible method of connecting the microphone
level output of the M677 Mixer to the great variety
of amplifier and input receptacle configurations.
Enables you to connect to virtually any PA system.
Kit Includes:
=
One 4.6m (15 ft) two-conductor shielded cable
with male and female professional three-pin
connectors.*
One 305 mm
(12
in.) two-conductor shielded
adapter cable with female professional three-
pin audio connector* on one end and
Hub-
bell twist lock plug on other end.
One 305 mm (12 in.) single-conductor shielded
adapter cable with female professional three-
pin audio connector* on one end and
Am-
phenol type MC1 on the other end.
One Phone Plug adapter for use with Am-
phenol type MCI Connector.
*Designed to mate with Cannon XL Series, Switchcraft
A3
(Q.G.)
Series or equivalent connector
RKl20P AND RK121P MICROPHONE CONNECTORS
The RK120P is a female professional three-pin
microphone connector suitable for connecting to the
MIC OUTPUT of the
M677. The RK121P is a male
professional three-pin connector for connecting low-
impedance microphones to the MIC INPUTS of
the M677.
A68R SERIES RACK PANEL KITS
Each kit consists of a 19 in. x
3%
in. (483 mm x
90 mm) precut rack panel and necessary hardware
for rack mounting of the M677 with its cover in
place. The kit is available in two colors:
A68R Gray Finish
A68R-BL Black Finish
A67H HANDLE/TILT STAND
The A67H provides a convenient means of tilting
the M677 to permit better panel visibility and greater
ease of operation in some conditions. In the locked
(tilt) position, the front panel will be elevated about
20".
In
the free position, the A67H serves as a
rugged carrying handle.
AC60 ATTACHE CARRYING CASE
This case
is
compartmentalized and foam lined for
an M677 and accessories.
A678 BATTERY POWER
SUPPLY
The A676 eliminates need to connect the M677 to
a mixer product with
a
built-in power supply. The
battery complement is three
Eveready type
222,
216,
or equivalent 9 volt batteries. At room temperature,
the
A67B will operate the M677 continuously for
approximately
70 hours.
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